Comparison

BIO3 vs CircadiaOS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

BIO3

This app helps Dartmouth College BIO3 students track their mindfulness practice. Log meditation sessions, monitor progress, and view course leaderboard standings. It prioritizes user privacy with secure data storage and opt-in research participation.

Highlights
  • Log meditation sessions (duration, quality, stress)
  • Track group practice participation
  • Monitor personal progress
  • View course leaderboard
  • Access mindfulness resources
  • Secure data storage
Features
Read full description

BIO3 is a mindfulness tracking app developed by the Media and Health Lab at Dartmouth College, designed exclusively for students enrolled in the BIO3 course. WHAT YOU CAN DO: - Log daily meditation sessions including duration, quality ratings, and stress levels - Track your group practice participation records - Monitor your personal progress over time - View your standing on the course leaderboard - Access curated resources to support your mindfulness practice PRIVACY FIRST: Your data is stored securely and is never sold or shared with third parties. Students who choose to participate in research do so through a separate opt-in process. All research data is anonymized and used only for academic publications by the MHBLD Lab at Dartmouth College. Developed by the Media and Health Lab (MHBLD) at Dartmouth College.

About

CircadiaOS

This app learns your body's ideal sleep temperature and automatically adjusts your smart thermostat throughout the night. It uses data from your wearable to personalize a four-phase temperature schedule for optimal sleep recovery. Requires a compatible smart thermostat and sleep-tracking wearable.

Highlights
  • Learns ideal sleep temperature
  • Personalized four-phase temperature schedule
  • Integrates with smart thermostats
  • Syncs with sleep-tracking wearables
  • Analyzes sleep quality
  • Two-week calibration period
Features
Read full description

CircadiaOS adjusts your bedroom temperature through the night, automatically. Your body temperature isn't constant while you sleep. It drops as you fall asleep, stays low through your deepest sleep, and rises again before you wake. A thermostat held at one number all night works against that. CircadiaOS builds a temperature curve for your night and drives your smart thermostat to follow it. Connect a wearable and the curve adapts to your own recorded nights instead of a general model. HOW IT WORKS - Connect your thermostat and your wearable - CircadiaOS builds a curve from your profile on night one - As your nights accumulate, the curve shifts to your own data - See exactly which parts come from your sleep and which are still estimates WHAT YOU SEE - Tonight's schedule, phase by phase - Why each setpoint is what it is - Your best and worst nights, side by side, and what differed Requires a compatible smart thermostat. A wearable is optional but unlocks personalization from your own sleep data. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

BIO34 screens
CircadiaOS4 screens

Verdict

The call

The clearest difference is rating: BIO3 at 5.0 against CircadiaOS's 3.8. BIO3 also leads on in-app purchases (none vs 4) and ads (none vs shown). CircadiaOS's advantage is ratings volume (10 vs 2). On price, update cadence, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CircadiaOS sells 4 in-app purchases, starting at $9.99 per month. BIO3 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

BIO3 holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: CircadiaOS has 10 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

BIO3 ships an update every 2 days, CircadiaOS every 3 days. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

Scorecard5 real differences · 5 level
BIO3 versus CircadiaOS: the parameters behind the verdict, then further details
ParameterBIO3CircadiaOS
PriceFreeFree
Rating5.0 (2 ratings) — better3.8 (10 ratings)
Positive reviews—75.0% of reviews
Number of ratings210 — better
Update frequencyEvery 2 days — betterEvery 3 days
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.518.0 — better
Further details — not scored
Size4 MB25 MB
Age rating4+17+
DeveloperYashaswini Rajendra BhatCircadiaOS LLC

In-app purchases

None

BIO3

No in-app purchases

4 purchases

CircadiaOS

Subscriptions4
  • CircadiaOS Lite Monthly$9.991 Month
  • CircadiaOS1 Month trial$19.991 Month
  • CircadiaOS Lite Yearly$99.991 Year
Show 1 more
  • CircadiaOS1 Month trial$159.991 Year

Questions

Is BIO3 free?
BIO3 is free to download, with no in-app purchases.
Is CircadiaOS free?
CircadiaOS is free to download, with in-app purchases available.
Which has better reviews, BIO3 or CircadiaOS?
BIO3 is rated higher. BIO3 averages 5.0 out of 5 from 2 ratings, while CircadiaOS averages 3.8 from 10 ratings.
Do BIO3 or CircadiaOS have ads?
CircadiaOS shows ads; BIO3 does not.
Which is updated more often, BIO3 or CircadiaOS?
BIO3 ships an update every 2 days, and CircadiaOS every 3 days. Most recently, BIO3 was updated on October 16, 2026 and CircadiaOS on October 7, 2026.

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